GB2297157A

GB2297157A - Air intake and method of operation

Info

Publication number: GB2297157A
Application number: GB9601242A
Authority: GB
Inventors: Andrei Livtchak; Jouni Laurikainen; Jukka Manninen; Tapio Tiainen; Arvo Aalto
Original assignee: Halton Oy
Current assignee: Halton Oy
Priority date: 1995-01-20
Filing date: 1996-01-22
Publication date: 1996-07-24
Anticipated expiration: 2016-01-22
Also published as: GB9601242D0; SE9600190D0; SE9600190L; FR2729745A1; FR2729745B1; FI99159C; DE19601554A1; FI950245A; GB2297157B; FI950245A0; FI99159B; SE513485C2

Description

1 Device for intake air and method for regulation of a device for intake

air 2297157 The invention concerns a device for intake air and a method for regulation of a device for intake air.

From the DE Patent No. 3,410,078, a solution is known for a device for intake air in which the equipment comprises blades which are placed in stationary positions, which are fitted in a ring form, and which are fixed to a central core tube. In the solution of equipment, the flow of air through the device is regulated by displacing a valve disk placed at the end of the core tube simultaneously with a second regula- tor. The second regulator consists of a closing ring. Thus, in the solution in accordance with DE 3,410,078, the position of the first regulator and the position of the second regulator are regulated at the same time.

In the present application, a solution is described that is considerably simpler than that employed in the construction of said DE patent. In the present invention, it has been realized to use exclusively a closing ring and a blade construction wherein the blade construction has been chosen so that an adequate deviation of the air towards the sides is obtained without having to use a separate core tube and a connected valve disk that closes and opens said tube.

In the solution in accordance with the present invention, with little air flow quan tities, the air flow is passed along two paths, i.e. along a first path as the flow L, through the blades, and along a second path L2 as a lateral flow, in which case the lateral flow directs the overall flow down and prevents spreading to the sides of the vortical flow coming through the blades. In such a case, the lateral flow acts as a sort of a curtain jet. When the lateral flow passage is closed, in the construction of the present invention, by means of the blades alone, the air flow is diverted towards the sides so that the air flow proceeds along the curved face of the outer tube while 2 adhering to said face by the effect of a Coanda effect, in which case the casting pattern of the overall air flow becomes wide.

According to the invention, a blade construction is employed which comprises at least two rings of blades. Owing to said favourable construction, the device does not require a central guide part for a separate central flow, which is the case, for example, in the construction of the DE patent 3,410,078. The construction in accordance with the present invention, which includes at least two rings of blades, is advantageous expressly in situations of regulation in which it is desirable to divert the flow to a wide area also towards the sides. This has not been achieved in the prior-art solutions by means of sets of blades alone, but said lateral diverting has been accomplished by means of a separate guide plate, said guide plates being fitted to regulate a separate central flow.

Further, in the present application, a preferred embodiment of the invention is described, in which the position of the closing ring is adjusted automatically when the quantity of flow of air through the valve is regulated. The higher the pressure that is applied to the closing ring in the device for intake air, the higher is the force with which the device and the related closing ring are pressed against the spring force, the closing ring and the connected seal or equivalent being thereby shifted forwards. In the other extreme position of the closing ring, the air flow passage for the lateral flow at the inlet end of the blade-ring tube is closed, and the air flow is passed through the blade-ring tube to the blades, which divert the flow downwards and towards the sides. Thus, in the solution, the casting pattern of the air flow is adjusted in accordance with the air flow quantity. The larger the quantity of air, the more is the air flow widened by reducing the lateral flow through the annular flow passage between the outer tube and the blade-ring tube.

The device for intake air in accordance with the invention is characterized in that, in the construction of the device for intake air, the set of blades consists of at least two rings and, thus, comprises blades between the first blade-ring tube and the 3 central shaft, and that there is at least a second blade ring, which comprises blades that have been fitted between the blade-ring tube and the blade-ring tube.

The method in accordance with the invention is characterized in that, in the method, 5 air is made to flow through the blade construction composed of at least two rings.

In the following, the invention will be described with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings, the invention being, however, not supposed to be confined to said embodiments alone.

Figure IA is an axonometric view of an intake-air device in accordance with the invention.

Figure 113 shows the intake-air device as shown in Fig. 1A, in which device the displaceable closing part can be placed in different closing positions so that the spindle in the interior of the shaft is rotated by means of the end disk 0, with which spindle the closing part is connected. The figure shows the intake-air device in the position that permits the lateral flow.

Figure 1C illustrates the closing part of the intake-air device shown in Fig. 1B in the position that closes the passage of lateral flow.

Figure 2A is a sectional view of a second embodiment of the invention. In Fig. 2A, a first position of regulation of the device in accordance with the invention is shown. The actuator that displaces the closing part is a pneumatic cylinder.

Figure 2B shows a second position of regulation of the device shown in Fig. 2A, in which position the passage of lateral flow is closed.

Figure 2C shows an embodiment of the invention in which the actuator that displaces the closing part is an electric motor.

4 Figure 2D is a sectional view showing one half of the intake-air device shown in Fig. 2A, viewed in the direction of the arrow K,.

Figure 3A is an axonometric view of the fixing of the blade to the bladering tube and to the central shaft.

Figure 3B shows a blade wheel consisting of two groups of blades.

Figures 4A and 4B illustrate an embodiment which permits automatic operation, i.e.

a spring construction, in which the closing part can be displaced against spring force in view of automatic regulation of the lateral flow so that it depends on the air flow quantity and/or on the pressure that is applied by the flow to the closing part. Fig.

4A shows one extreme position of the closing part, in which position the air flow through the passage of lateral flow is at the maximum. Fig. 4B shows the closing part in a position in which the passage of lateral flow is closed.

Fig. 1A is an axonometric view of an intake-air device in accordance with the invention. The intake-air device 10 comprises an outer tube 11, which terminates in a curved collar 12. Inside the construction, there is a blade-ring tube 13, and it is connected with radially positioned stationary, non-revolving blades 14a'1, 14a'2-.- The blades 14al, 14a2... are connected from their roots to a stationary central shaft 15, which is impenetrable by the flow, and from their outer ends to the blade-ring tube 13'. The blades 14a'j, 14a'2... are connected from their roots to the blade-ring tube 13'.

The central shaft 15 comprises an outside telescopic frame 15al, which is in a stationary position, and an inner second frame 15a2, which is displaceable in relation to said outside frame. Between the frames 15a, and 15a2, there is a spring J.

Further, the frame 15a, is connected with a central spindle 15a3, which includes a disk 0 for rotation at its end. The spindle 15a3 includes a threading C2 on its outer face, and similarly the telescopic frame 15a2 includes a through opening G for the spindle 15a3 and a threading Cl in said opening. Thus, when the spindle 15a3 'S rotated from the end piece 0, the telescopic frame 15a2 and the connected closing part 16 are displaced, which closing part includes a seal ring 16b or equivalent. Thus, when the closing part is displaced manually, the annular flow passage F between the blade-ring tube 13 and the outer tube 11 is opened and closed.

In the embodiment of Fig. 1A, there are two blade rings, i.e. the blade rings D, and D2. The inner blade ring D, comprises a lower number of blades 14al,14a2... than the outer blade ring D2 does, in which the number of blades 14a'l, 14a'2... is higher, preferably twice as high as in the inner blade ring D,.

Fig. 113 is a sectional view of an intake-air device in accordance with the invention.

In the embodiment shown in the figure, there is a separate closing part 16, which is connected with the displaceable frame part 15a2 of the central shaft 15. The frame part 15a2 is placed inside the stationary frame part 15a, and is displaceable in relation to said stationary frame part 15al. Between the frame parts 15a, and 15a2, there is a spring J. The spindle 15a3 is mounted in the shaft 15 centrally and comprises a disk 0 at its end, from which disk the spindle 15a3 can be rotated. The outer face of the spindle 15a3 is provided with a threading C2, which is jointly operative with the threading Cl in the end opening G in the displaceable frame part 15a2. The end opening G may also include a metal bushing which is provided with a threading. Thus, when the spindle 15a3 is rotated manually from outside the actuator, the part 15a2 and the connected closing part 16 are displaced, and thereby the closing and opening of the lateral flow passage F is regulated. The shaft 15 preferably consists of four parts. The base frame 15a, is a sleeve-shaped structure preferably made of plastic, in whose interior the frame part 15a2 is fitted to move telescopically. The part 15a2 is also preferably made of plastic. The spindle 15a3 'S preferably a threaded bar, and it is fitted to be rotatable in the threading C, provided in the part 15a2, preferably so that a threaded bushing (not shown) is fitted in the part 15a2. On the outer face of the part 1.5al, there is preferably a metal tube 15a'l, to which the blades have been fixed by welding. The material of the intake-air device, such as, for example, of the blades, is generally metal. It is, however, also possible to use other materials.

6 Fig. 1 B shows the lateral flow passage F in the open position, and Fig. 1 C illustrates a position of regulation of the intake-air device in which the lateral flow passage F is closed. When the lateral flow passage F is in the open position, flow is permitted through the lateral flow passage F, and said lateral flow operates as a curtain jet and, thus, also directs the flow L, straight downwards. When the lateral flow passage F is closed, the flow is spread by means of the two-ring blade construction favourably efficiently also to the sides in the room space H.

Fig. 2A is a sectional view of a second embodiment of the invention. Fig. 2A shows a position that permits a lateral flow L2 of air. According to the invention, the closing part 16 and its seal ring 16b or equivalent are displaced by means of an actuator 17. The central shaft 15 is a structural part impenetrable by the flow and comprising a telescopic frame construction, in which there is a first telescopic frame 15a, and a second frame 15a2, which is displaceable in relation to the first frame and moves in the cavity in said first frame. Further, the first frame 15a, is connected with a central spindle 15a3, which comprises a piston 15a4 at its end. Further, the part 15a, may comprise a metallic outer tube 15a'l, which surrounds the part 15a, and to which the blades have been fixed from their roots by welding. In the way shown in the figure, the actuator 17 is preferably a pneumatic cylinder, and a pressure is applied to the pressure space M between the stationary piston 15a4 of the pneumatic cylinder and the cylinder frame 15b, and the telescopic inner frame 15a2 moving on the piston rod 15a3 along a linear path and the connected closing part 16 and its seal ring 16b or equivalent are displaced towards the blades 14 and towards the forward edge N of the blade-ring tube 13, seen in the flow direction. The movement takes place against the spring force of the spring J. The spring J is placed between the parts 15a, and 15a2. The spring J restores the closing part 16 to its original position when pressure is no longer applied to the space M.

Fig. 2A shows a position of regulation of the device in which the air flow (arrow L) is passed both through the blades 141,142; 14a'l, 142 and between the blade-ring tube 13 and the outer tube 11. The air flow through the blades, i.e. between the blade-ring tubes 13,13' and between the blade-ring tube 13' and the 7 central shaft 15, centrally is denoted with the arrow Lp and the air flow between the blade-ring tube 13 and the outer tube 11 is denoted with the arrow L2. The flow 1-2 is directed straight down and, in a way in itself known, operates as an annular curtain jet.

In the way shown in Fig. 2A, the inner telescopic frame 15a2 'S connected from its flange 15as to the closing part 16, i.e. the closing ring. When the actuator 17 is operated, the ring 16 is shifted in the direction indicated by the arrow S, in Fig. 2A. When the closing part 16 is in the position shown in Fig. 2A, flow is permitted both through the blades, i.e. between the blade-ring tubes 13 and 13' and between the blade-ring tube 13 and the central shaft 15, and through the flow passage F between the blade-ring tube 13 and the outer tube 11. The air flow through the blades 14al,14a2 is denoted with the arrows L, and the flow through the annular flow passage F between the blade-ring tube 13 and the outer tube 11 with the arrows L.2.

Fig. 213 shows a position of the closing ring 16 in which flow is permitted centrally through the blade-ring tube 13 only, i.e. through the radial blades 14al, 14a2... (flow arrows L,).

The position of regulation shown in Fig. 2B can be concerned in particular with large quantities of air when a large quantity of air is supposed to be passed into the room space H. With large quantities of air, the access of the air flow into the annular duct F between the blade- ring tube 13 and the outer tube 11 is closed by, by means of the device 17, shifting the closing ring 16 in the direction indicated by the arrow S,, in which case the closing ring 16 is placed against the end N of the bladering tube 13. Thereby, the air flow is made wider. In such a case, there is no flow L2, so that the so-called curtain-jet action is prevented, and the blades 14al, 142...

14a'l, 14'2... in the set of blades D1,D2 spread the flow efficiently to the sides.

Fig. 2C shows an embodiment of the device in accordance with the invention in which the actuator 17 that displaces the closing ring 16 is an electric motor. As is shown in the figure, the construction is highly similar to the construction with a 8 pneumatic cylinder. The frame 17a of the actuator 17 is fixed to the closing part 16.

In this embodiment, the spindle 15a3 is a fixed part of the central shaft 15. The spindle 15 is connected with a rack 170, with which the toothed wheel 172 on the output shaft of the electric motor 171 in the actuator 17 is coupled operationally.

When the control current is connected to the motor 171, which is fixed to the frame 17a, the movement of rotation both of the motor 171 shaft and of the toothed wheel 172 is converted to a linear movement of the frame 17a. When no current is passed to the electric motor, the spring J restores the closing part 16 to its initial position, in which the flow passage F for the lateral flow L2 is open.

Fig. 2D is a sectional view showing one half of the intake-air device shown in Figs. 2A and 2B, viewed in the direction of the arrow K, in Fig. 2A.

In the embodiments of the figures, there are preferably two blade rings. It is obvious that, when the size of the intake-air device becomes larger, there may also be a higher number of blade rings.

Fig. 3A is an axonometric illustration in part of the blade construction. The blade 14a, has been fixed by welding to the central shaft 15 as well as, from its outer circumference, to the inner face of the blade-ring tube 1Y. The blade 14a', has been fixed by welding to the blade-ring tube 13' from its root and to the blade-ring tube 13 from its end.

Fig. 3B illustrates an embodiment of construction in which the blade construction comprises two groups of blades, i.e. a first blade ring D,, which comprises the blades 14al,14a2,14a3..., and a second blade ring D2, which comprises the blades 14a'p 14a'2,14a'3... The group of blades 14a p 142... in the inner ring D, comprises a number of blades whose number is about half the number of the blades in the outer ring D2. The blades 14al, 142... in the blade ring D, have been connected from their roots to the shaft 15 and from their ends to the blade-ring tube 13', which is a tubular structural component. The blades 14a'p14a'2... in the blade ring D2 have been connected from their roots to the outer rim f' of the blade-ring tube 13' 9 preferably by welding and from their ends to the outer blade-ring tube 13. The blade-ring tubes 13,13' are tubes of circular section, whose wall thickness X10 is preferably in the range of 0.5---2.0 mm and whose length X20 in the flow direction is preferably in the range of 20... 100 mm. The direction of flow of air is denoted with Lp The inner ring D, comprises a lower number of blades than the outer ring D2 does. Preferably, the outer ring D2 comprises a number of blades twice as high as the number of blades in the inner ring D,. Each blade 14a 1, 142...; 14a'l, 14'2... has an invariable radius (R) over the entire length of the blade. The angle (a) between the tangent of the face drawn at a certain point of the face of the blade 14al, 14a2...; 14a'j, 14'2... in the plane of wiping of the radius of curvature and the straight line drawn through said point and parallel to the central axis (X-axis) of the actuator and to the central axis (X-axis) of the shaft 15 is preferably in the range of 101 < ce < 6T. In each particular blade, the angle ce is, however, preferably invariable over the entire length of the blade. Likewise, in the same set of blades, preferably the same angle ce and the same radius R are used in all the blades, both in the blades in the ring D, and in the blades in the ring D2. The radius of curvature R has a centre of curvature Q, and on each blade face the centres of curvature Q form an axis X' of centres of curvature. In Fig. 3B, the straight line parallel to the X- axis and drawn through the point P is denoted with v, and the tangent drawn at the point P is denoted with t, said tangent being, thus, perpendicular to the radius R. The centre of curvature of the radius R is Q, and the radius R is perpendicular to the axis X' of centres of curvature. Correspondingly, the ratio of the width h of the face of the blades 14al, 14a2...; 14a'j, 14a'2-.. that guides the air flow to the distance b between the blades at said point of blade length is smaller than 0.5 over the whole length of the blade. The width h of the blade face refers to the measure of length of the side line of the blade, i.e. to the so-called circumferential measure, that has been measured from the circumference of the blade and in the plane of the blade and that is perpendicular to the length of the blade. The length of the blade refers to the measure from the root of the blade to the tip of the blade. Moreover, each blade 14a l, 14a2...; 14a'p 14a'2... has an invariable radius of curvature (R) over the entire length of the blade, which radius is in the range of 30 < R < 150 mm, but which is, however, substantially invariable in the same blade.

The construction of the multiple-ring blade construction shown in Fig. 3B is simple and, thus, also permits favourable manufacture of blade sizes of larger diameters.

Figs. 4A and 4B illustrate an embodiment of the invention in which the closing part 16 is displaced against the spring force of the spring J exclusively by means of the air flow. The larger or higher the air flow and/or its pressure, the higher is the force that acts upon the closing part 16 and displaces the part 16 and the seal l6b or equivalent provided on it towards the end N of the blade-ring tube 13. In its extreme position, the closing part 16, i.e. the closing ring, closes the annular lateral flow passage F between the outer tube 11 and the blade-ring tube 13. Then, the lateral flow does not operate as a curtain jet, but all the flow passes through the blades 14al, 14a2; 14a',, 14a'2 and is spread, besides downwards, by means of the blades also widely towards the sides. With little air flows, the lateral flow passage F is fully open at its top end, in which case, by means of the lateral flow, when the lateral flow L2 operates as a curtain jet, the air flow L, is passed efficiently down.

Also in this embodiment, the central shaft 15 is a telescopic structural part, which comprises an outer shaft part 15a, and an inner shaft part 15a2, which moves inside the outer shaft part in relation to said outer part. The spring J is fitted inside the shaft part 15a2 to act upon the end of the part 15a2 and upon the inner end face of the shaft part l5al. Thus, the spring J is fitted between the shaft parts 15a, and 15a2 mobile in relation to one another. Further, as was the case in the embodiments above, the shaft 15a2 is connected with the closing part 16 and with the related seal ring l6b or equivalent. When the air flow acts upon the closing part 16 and upon the end disk 15a5 of the shaft 15a2, the shaft 15a2 and the related closing part 16 are displaced by the effect of the air flow against the spring force of the spring J, and the closing part 16 is shifted to the other extreme position, in which the closing part 16, its seal ring or equivalent 16b, closes the lateral flow passage F. In this embodi ment, the spindle 15a3 acts just as a guide. Thus, in this embodiment, the spindle is not threaded.

11

Claims

CLAIMS:

1. A device (10) for intake air, Comprising an outer tube (11) and at least one blade-ring tube (13) placed inside in relation to said outer tube, and blades (14al, 14a2; 14a'l, 14a'2) inside the blade-ring tube (13), which blades are connected to the central shaft (15) of the device from their roots and to the blade- ring tube (13,13') from their ends, c h a r a c t e r i z e d in that, in the construction of the device for intake air, the set of blades consists of at least two rings (D1,D2) and, thus, comprises blades (14al,14a2...) between the first blade-ring tube (13) and the central shaft (15), and that there is at least a second blade ring (D2), which comprises the blades (14a'p 14a'2...), which have been fitted between the blade-ring tube GY) and the blade-ring tube (13).

2. A device for intake air as claimed in claim 1, c h a r a c teri zed inthatthe inner ring (D,) comprises a lower number of blades than the outer ring (D2).

3. A device for intake air as claimed in any of the preceding claims, charact e r i z e d in that the blades (14al, 14a2...;14a'1,14a'2) in the same set of blades (D1,D2) have an equal, invariable radius (R), compared with one another, which radius is preferably in the range of 30 mm:5 R:5 150 mm, and that the angle (a) between the tangent (t) of the face drawn at a certain point (P) of the face of the blade in the plane of the radius of curvature (R) and the straight line (v) drawn through said point (P) and parallel to the central axis (X-axis) of the shaft (15) and of the intake-air device (10) is preferably in the range of 100 -< a t 60', and that said angle (a) is, however, substantially invariable in the same blade, and that the ratio of the width (h) of the face of the blade (14al,14a2...) that guides the air flow to the distance (b) between the blades is smaller than 0.5 over the whole length of the blade.

4. A device for intake air as claimed in any of the preceding claims, charact e r i z e d in that each blade (14al, 142...; M&I, 14'2...) has an invariable radius of curvature (R) over the entire length of the blade.

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5. A device for intake air as claimed in claim 1, c h a r a c t e r i z e d in that the intake-air device (10) comprises an outer tube (11) and a blade-ring tube (13) and, inside the blade-ring tube, at least one set of blades (14al, 14a2...) that are connected with the central shaft (15), in which intake-air device construction there is a first flow passage for a flow (L,) through the blades (141,142; 14a'l, 14'2) and a second flow passage (F) through an annular duct between the blade-ring tube (13) and the outer tube (11), said flow (L2) through the lateral flow passage (F) being regulated by means of a separate closing part (16), and that the construction cornprises a spring (1), against whose spring force the closing part (16) can be moved.

6. A device for intake air as claimed in claim 1, c h a r a c t e r i z e d in that the closing part (16) is connected with the central shaft (15), with the displaceable shaft part (15a2) of said shaft, upon which shaft part a spring (J) has been fitted to act, while the spring (J) is placed between the displaceable shaft part (15a2) and the stationary shaft part (15al) of the central shaft (15).

7. A device for intake air as claimed in claim 1, c h a r a c t e r i z e d in that the closing part (16) is connected with an actuator (17), which actuator displaces the closing part (16).

8. An intake-air device as claimed in the preceding claim, c h a r a c t e r i z e d in that the actuator (17) is a cylinder device, preferably a pneumatic cylinder.

9. A device for intake air as claimed in any of the preceding claims 8 or 9, c h a r a c t e r i z e d in that the cylinder device comprises a spindle (15a3) that is connected with the central shaft (15) and is placed in a stationary position in relation to said shaft (15).

10. A device for intake air as claimed in the preceding claim, c h a r a c t e r - i z e d in that the end of the spindle (15a3) is connected with a piston (15a4), in which case, when a pressure is applied to the pressure space (M) between the piston (15a4) and the cylinder frame, the cylinder frame and the connected closing part 13 (16), preferably a closing ring, are displaced towards the front edge (N) of the blade-ring tube (13).

11. A device for intake air as claimed in any of the preceding claims 1 to 7 or 9, c h a r a c t e r i z c d in that the actuator (17) that displaces the closing part of the intake-air device is an electric motor.

12. A device for intake air as claimed in any of the preceding claims, c h a r a c - t e r i z c d in that a spring (J) has been fitted between the actuator (17) and the shaft (15), the closing part (16) being restored to its original position by means of the spring force of said spring when the control current/voltage of the actuator (17) has been switched off or the pressure connection to the actuator been closed.

13. A device for intake air as claimed in any of the preceding claims 1 to 7 or 9 or 12, c h a r a c t e r i z e d in that inside the shaft (15) there is a spindle (15a3), which is provided with a threading (C2), which threading is engaged with the threading (C,) in the displaceable shaft part (15a2), which displaceable shaft part (15a2) is connected with a closing part (16), in which case, when the spindle (15a3) is rotated, the closing part (16) is displaced, and that the spindle (15a3) is provided with an end disk (0) or equivalent, whereby the spindle (15a3) can be rotated from the end disk (0) and the valve be regulated from the front side of the intake-air device, i.e. from the side to which the flow is discharged from the intake-air device.

14. A method in the regulation of an intake-air device, in which method air is made to flow through non-revolving blades, an intake-air device being employed in the method which comprises an outer tube (11) and at least one blade-ring tube (13,13') placed inside in relation to said outer tube, air being made to flow through the flow passage (F) between the outer tube (11) and the outer blade-ring tube (13) when, seen in the direction of flowing of the air, the displaceable closing part (16) placed ahead of said tubes (13,13') is in a position that permits a flow through the gap between the outer tube (11) and the outer blade-ring tube (13), and that, when flow into said flow passage is obstructed, air is made to flow primarily straight down and, 14 when flow is permitted through said flow passage, the air flow is spread in the lateral direction over a wider area, c h a r a c t e r i z e d in that, in the method, air (arrow L,) is made to flow at least through a blade construction consisting of at least two rings (Dl,D2).

15. A method as claimed in claim 14, c h a r a c t e r i z e d in that such a blade construction consisting of at least two blade rings is used in which the outer ring includes a higher number of blades than the inner ring and in which each blade in each ring has an invariable radius (R) over the entire length of the blade.

16. A method as claimed in the preceding claim, c h a r a c t e r i z e d in that the closing part (16) is displaced automatically into the position of closing of the flow passage (F) by means of the pressure of the air flow.

17. A device for intake air, substantially as hereinbefore described with reference to or as shown in the accompanying drawings.

18. A method in the regulation of an intake-air device, substantially as hereinbefore described with reference to or as shown in the accompanying drawings.